That's all good real world information.
However this thread is typical of internet advice in any venue. A guy asks about a little more power for camp ground use for the least expense and he gets suggestions for a blower on his car and an AC conversion for the cart.
His original question was PQ bandit or controller upgrade. I'm assuming the budget is around $350 - $500 investment. The TXT48 has a long stack motor capable of making more torque than the stock controller allows. Anybody who has tried the Alltrax XCT400 in this cart will highly recommend this as a good way to get significantly more power and speed.
I doubt the bandit upgrade can match the XCT performance on hills given the stock controller and solenoid in use.